Hollow sway bar design philosophy race car technology for the. The adjustable sway bar exploits this relationship by providing multiple holes at the end of the sway bar. Cutting and welding a sway bar is done all the time and is an acceptable way to resize the width of one. Thickness of hollow sway bar is thickened to twice at ends to reduce stress. If we have a sway bar wheel rate of 600 poundsinch and a sway bar motion ratio of 0. Theyre manufactured with superior materials using stateoftheart equipment to ensure maximum strength and performance. How to measure a sway bar diameter 6 different ways. Any thickness outside the standard tubing sizes would cost too much in raw material to be marketable. Wheel rate is the spring rate of a theoretical spring attached directly above your wheel. Sway bars 4 chromoly sway bar material free shipping. They are a solid bar that is double heat treated with splines timed for perfect arm alignment for bar interchange.
Torsion bar wheel rate calculator available on this page are a useful chart and calculator for anyone looking to determine their torsion bars equivalent wheel rate. Eibach lift kits, lowering springs, race springs, shocks. The calculations have already been done for you so whichever number the lines point to is your sway bar size. So in this tutorial, youll be finding out more about sway bars and how to properly measure the diameter to them. Sway bar spring rate formula normpeterson structural 14 mar 11 09.
The eibach twoway adjustable rear bar is 29mm in diameter, also hollow construction but of unspecified wall thickness, and is rated at. Visitors can find updated technical and application information here on our complete line of swayaway suspension components and accessories. It is determined using track width and suspension and sway bar wheel rates but does. Such three spring systems are common in higher formula motorsports events when allowed by the rules. This will be enough room for arms and shaft collars. Shop sway bars from the biggest brand names, including competition engineering, hotchkis sport suspension, summit racing, edelbrock, addco, hellwig, eibach, umi performance, and many more. Because end section thickness and also diameter is. This problem was cured in later models by reducing the sway bar stiffness some, to allow more body. In order to confirm you are buying the correct size sway bar bushings, you need to measure your sway bar. Most of these use tools you have laying around the house. The answer goes back to that guess above, that a sway or actually antisway bar tends to keep the car from swaying or more precisely, from leaning to one side or the other. Posted on august 3, 2015 march 8, 2019 by drew taylor. Sway bar rating techniques circle track magazine hot rod.
The sway bar is mounted using bushings in a transverse tube to the front end of the front clip. There are two major types of antiroll bar bushings classified according to the axial. If you cant find the answer to your question please dont hesitate. Jan 22, 2019 a sway bar reduces body roll by acting as a torsion bar that transfers load force from one side of the car to the other. When other springs sag, wear out, or create sketchy handling or a bonecrushing ride, top street tunerslike top race teams, from f1 to wrc, from le mans to nascarinevitably turn to eibach. A method to identify the true rate of your sway bar hot rod. Dodge charger performance sway bars links, bushings, adjustable. High performance front sway bar available for 197074 ebody mopar and 1970 mopar bbody, dodge, plymouth.
Antisway bars effectively reduce suspension lean and sidetoside body roll when vehicle weight shifts improves overall stability, driver control, and cornering while maintaining proper alignment and tire grip. If the sway bar cannot support the weight of one corner of the car, the chassis may touch the ground or damage the sway bar. A sway bar reduces body roll by acting as a torsion bar that transfers load force from one side of the car to the other. Similarly we calculate the sway bar motion ratio by dividing the distance from the inner.
Sway bar diameter conversion chart the below chart is an indicative guide only to show percentage % increase in torsion for bars of the same shape, design and material specifications. At andys auto sport, we have a huge variety of subaru impreza sway bars to ensure that you have every antisway bar option available to you. Enter anti sway bar length, arm length, outside diameter, inside diameter, and wall thickness. Buying the correct size bushings is vital to ensuring optimum performance from your sway bar.
How an antisway bar works put simply, an antisway bar is a ushaped metal bar that connects to both wheels on opposite sides of the car at the ends and connects to the chassis in the middle. Investment cast steel bar ends offer performance and appearance improvements over the traditional beat it flat and punch a hole in it manufacturing easytoinstall spherical end links with barrel lock nuts. It can sometimes be a challenge to choose the right sway bar for your car and driving style. Sway bar spring rate formula automotive suspension. This calculation does not take into account flex allowed from sway bar bushings, which can be very significant when using soft rubber bushings. Given that this is a description of one way to measure sway bar wheel rate in situ there are. Exactly how much of the spring on the opposite side of the suspension is brought into play depends on the thickness, or strength, of the sway bar. Replacing the front sway bar will change certain handling characteristics, while replacing the rear will change others. I dont remember what diameter they are, when i had to replace the sway bar rubbers on my ea i had to quote that it was a s pack to get the right size. From memory, the s packs, futuras and fairmonts have a thicker sway bar.
The eibach twoway adjustable rear bar is 29mm in diameter, also hollow construction but of unspecified wall thickness, and is rated at 515 lbin in position 1 and 605 lbin in position 2. To order, add the length of the sway bar you need to the part number listed below. This simple calculator will help do that for solid and hollow sway bars. Bushings that are too large will not properly grip and support the sway bar. Jul 31, 2015 the calculations have already been done for you so whichever number the lines point to is your sway bar size. We work solely with leading manufacturers of performance suspension products. The arm of the sway bar is the portion that extends from the frame bushings to the end links.
Late model restoration has put together a quick and easy mustang sway bar size chart to help you get the right sway bar bushings and upgraded sway bars. An antiroll bar is a part of many automobile suspensions that helps reduce the body roll of a. The sway bar arm lengths are listed across the top centerline of the sway bar to centerline of the arm link. The below chart is an indicative guide only to show percentage % increase in torsion for bars of the same. The length of the arm influences the rate of the bar as the longer the arm is, the less effective the sway bar becomes. How sway bars work and why you should care speed academy. Tubular bar dimensions can be specified by outside diameter and wall thickness or by outside diameter and inside diameter. Using precision cnc tubing benders, investment cast steel bar ends, and delrin lined mount bushings. The speedwiz antiroll bar calculation computes the stiffness of antiroll bars anti sway bars. Sway bar rate calculator trying to get a rough idea of the spring rate of your sway bar. Available on this page are a useful chart and calculator for anyone looking to determine their torsion bars equivalent wheel rate. Swayaway has greatly expanded the tech room with new tools and resources to help you find the right suspension components and accessories for your application. The antisway bars ability to resist this twisting is determined by its torsional rigidity or stiffness, which in turn determines its ability to limit body roll. And in case you dont, we have a free printout tool that you can use to measure your.
For proper length take the width of frame rails where bar will be used and add 3. See freds book for more information on how the front and rear sway bar rates affect the handling. We have front and rear sway bars for most any make and modelforeign or domesticthat will fit cars of any age, from late models to vehicles circa 1928. The original formula is from fred puhns book on handling called how to make your car handle. Features precision cncbent tubing for accurate and repeatable fitment. Sway bars connect the left and right suspension components on a car so that when weight is transferred laterally, both the left and right suspension pieces will compress. How to measure your vehicles sway bar diameter wonderhowto. If you are looking for the mustang sway bar sizes for your fox body, sn95, new edge, s197, or s550. Ridetech has upgraded the traditional notion of sway bars with the new musclebar. Essentially, the ends of the bar are connected to the wheels while the center of the bar is connected to the body of the car. The popular puhn sway bar rate equation consistently underestimates actual, known sway bar rates so i came up with an equation that more accurately predicts real world sway bar rates. Apr 08, 2015 the arm of the sway bar is the portion that extends from the frame bushings to the end links. The total lateral load transfer is determined by the cg height and track width.
Believe it or not, this is the most complicated part. My sway bar formula uses arm leverage, arm length, bar length, bar outside od and inside id diameter or wall thickness in inches to estimate the sway bar rate. Follweiler look closely and youll see a short, adjustable upper third link. And, also inevitably, wonder why they didnt choose eibach in the first place. We go out of our way to carry every major line of subaru impreza sway bars, so that whether you are looking for a front subaru impreza sway bar or a rear sway bar or both, weve got it for you. Sway bar design metal and metallurgy engineering engtips. Sway bar rate calculator 2010 length of bar in bar out sidediameter in bar inside diameter in note. This can be used for comparison of different diameter bars. We carry a wide range of dodge charger performance sway bars to take your vehicles handling to the next level. To keep our measurements consistent, we make a few. Ridetech can now produce sway bars with unheard of dimensional and rate accuracy. Discussion in vt vx holden commodore 1997 2002 started by theghostoftime1978, apr 6, 2012. The bar diameters go up in small increments because the stiffness is proportional to radius raised to the 4th power.
Enter antisway bar length, arm length, outside diameter, inside diameter, and wall thickness. The program is capable of calculating failure loads, stress, strain and. Installation instructions and lifetime expert support on all purchases of 2011 ford f250 and f350 super duty vehicle sway bars. If the sway bar is thin and flexible it will allow a lot of movement on one side of the suspension with very little effect on the other. Im studying on the issue that do i have to make post weld heat treatment. Identical to spring rate, wheel rate is measured in lbsin. For example, an 18mm sway bar bushing set will only fit an 18mm sway bar. These rate charts covers the 3712 long sway bars most commonly found in nextel cup, busch and craftsman super trucks. A stiffer rear bar isnt going to reduce understeer, its gonna reduce roll oversteer instead. The diameter of the sway bar is listed on the left side of the chart. What does a sway bar do that the parts listed above dont do. Eibach makes the finest performance parts in the world.
The wall thickness is calculated from the inside diameter, and the inside diameter is calculated from the wall thickness. Nov 26, 2014 the antisway bars ability to resist this twisting is determined by its torsional rigidity or stiffness, which in turn determines its ability to limit body roll. It will calculate the spring rate for solid and hallow sway bars. If you make it and the front bar stiff enough, you can get the w115 problem it will corner hard enough to force the front outside tire off the rim. The stiffer the antisway bar is, the more the compressing force on the outside of the car is transferred across the chassis, helping keep the inside suspension loaded and. Sway bars how they work and how to choose the right size. Hollow sway bar design philosophy race car technology for. Nov 17, 2015 what does a sway bar do that the parts listed above dont do. As the roll center is lowered, more rear sway bar rate is needed to keep the car balanced, so this type of bar and the watts link work very well together. Whether youre replacing your old sway bar bushings, or just trying to determine what size sway bar you want to upgrade to, measuring the diameter of your current sway bar is vitally important. Whether theyre new or the same ones from the factory, each one can have a different measurement. Jul 31, 2015 how to measure a sway bar using 6 simple methods.
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